Jump to content

Messier 99

Coordinates: Sky map 12h 18m 49.6s, +14° 24′ 59″
From Wikipedia, the free encyclopedia
Messier 99
Galaxy Messier 99, Schulman Telescope[1]
Observation data (J2000 epoch)
ConstellationComa Berenices[2]
Right ascension12h 18m 49.625s[3]
Declination+14° 24′ 59.36″[3]
Heliocentric radial velocity2,404 km/s[5]
Distance45.2 Mly (13.87 Mpc)[5]
Group or clusterVirgo Cluster[6]
Apparent magnitude (V)9.9[7]
Apparent size (V)5.4 × 4.7[4]
Other designations
Coma Pinwheel Galaxy, Virgo Cluster Pinwheel, M99, NGC 4254, PGC 39578, UGC 7345[9]

Messier 99 or M99, also known as NGC 4254 or St. Catherine's Wheel, is a grand design spiral galaxy in the northern constellation Coma Berenices approximately 15,000,000 parsecs (49,000,000 light-years) from the Milky Way.[5] It was discovered by Pierre Méchain on 17 March 1781. The discovery was then reported to Charles Messier, who included the object in the Messier Catalogue of comet-like objects. It was one of the first galaxies in which a spiral pattern was seen. This pattern was first identified by Lord Rosse in the spring of 1846.[10][11]

This galaxy has a morphological classification of SA(s)c,[8] indicating a pure spiral shape with loosely wound arms. It has a peculiar shape with one normal looking arm and an extended arm that is less tightly wound. The galaxy is inclined by 42° to the line-of-sight with a major axis position angle of 68°.[6]

A bridge of neutral hydrogen gas links NGC 4254 with VIRGOHI21, an HI region and a possible dark galaxy. The gravity from the latter may have distorted M99 and drawn out the gas bridge, as the two galaxy-sized objects may have had a close encounter before parting greatly. However, VIRGOHI21 may instead be tidal debris from an interaction with the lenticular galaxy NGC 4262 some 280 million years ago.[6] It is expected that the drawn out arm will relax to match the normal arm once the encounter is over.

While not classified as a starburst galaxy, M99 has a star formation activity three times larger than other galaxies of similar Hubble type that may have been triggered by the encounter.[12] M99 is likely entering the Virgo Cluster for the first time bound to the periphery of the cluster at a projected separation of 3.7°, or around one megaparsec, from the cluster center at Messier 87. The galaxy is undergoing ram-pressure stripping of much of its interstellar medium as it moves through the intracluster medium.[6]

Four supernovae have been observed in this galaxy: SN 1967H (type II, mag. 14.6),[13] SN 1972Q (type unknown, mag. 15.8), SN 1986I (type II, mag. 14),[14] and SN 2014L (type Ic, mag. 15.4).[15]

See also[edit]


  1. ^ "The Schulman Telescope". www.as.arizona.edu. Retrieved 2022-02-20.
  2. ^ Dreyer, J. L. E. (1988). Sinnott, R. W. (ed.). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters. Sky Publishing Corporation/Cambridge University Press. ISBN 978-0-933346-51-2.
  3. ^ a b Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
  4. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 4254. Retrieved 2006-11-25.
  5. ^ a b c Tully, R. Brent; et al. (August 2016), "Cosmicflows-3", The Astronomical Journal, 152 (2): 21, arXiv:1605.01765, Bibcode:2016AJ....152...50T, doi:10.3847/0004-6256/152/2/50, S2CID 250737862, 50.
  6. ^ a b c d Vollmer, B.; Huchtmeier, W.; van Driel, W. (September 2005). "NGC 4254: a spiral galaxy entering the Virgo cluster". Astronomy and Astrophysics. 439 (3): 921–933. arXiv:astro-ph/0505021. Bibcode:2005A&A...439..921V. doi:10.1051/0004-6361:20041350. S2CID 17414818.
  7. ^ "Messier 99". SEDS Messier Catalog. Retrieved 30 April 2022.
  8. ^ a b de Vaucouleurs, G.; et al. (1991), Third reference catalogue of bright galaxies, 9, New York: Springer-Verlag.
  9. ^ "M 99". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-12-18.
  10. ^ Jones, K. G. (1991). Messier's Nebulae and Star Clusters (2nd ed.). Cambridge University Press. ISBN 978-0-521-37079-0.
  11. ^ Rosse, The Earl Of (1850). "Observations on the Nebulae". Philosophical Transactions of the Royal Society of London, Series I. 140: 499–514.
  12. ^ Chyży, K. T.; Ehle, M.; Beck, R. (September 2007). "Magnetic fields and gas in the cluster-influenced spiral galaxy NGC 4254. I. Radio and X-rays observations". Astronomy and Astrophysics. 474 (2): 415–429. arXiv:0708.1533. Bibcode:2007A&A...474..415C. doi:10.1051/0004-6361:20077497. S2CID 16273521.
  13. ^ Fairall, A. P. (August 1975), "The spectrum of the type II supernova 1967h in NGC 4254", Monthly Notes of the Astronomical Society of South Africa, 34 (7–8): 94–98
  14. ^ Penhallow, W. S.; et al. (June 1986), Marsden, B. G. (ed.), "Supernova 1986I in NGC 4254", IAU Circular, 4225 (2): 2, Bibcode:1986IAUC.4225....2P
  15. ^ "List of Supernovae", Central Bureau for Astronomical Telegrams, IAU, retrieved 2018-12-19

External links[edit]